TABLE 6.

Correlations among variables

Variable	Correlation with variable:
	Depth	PO4	NO3 + NO2	NH4	SO4	SO4 reduction rate (cm−3 day−1)	Mn(II)	Porosity	Si(OH)4
PO4	0.420
NO3 + NO2	−0.533	−0.488
NH4	0.888	0.630	−0.440
SO4	−0.076	0.371	0.384	0.120
SO4 reduction rare	0.367	−0.086	−0.507	0.194	−0.832
Mn(II)	0.220	0.826	−0.415	0.481	0.366	−0.297
Porosity	−0.836	−0.268	0.689	−0.561	0.279	−0.468	−0.048
Si(OH)4	0.368	0.922	−0.405	0.580	0.346	−0.250	0.844	−0.238
O2	−0.437	−0.284	0.880	−0.352	0.520	−0.436	−0.347	0.557	−0.346